OVERVIEW
GM/PCS 4-Speed Transmission
At the core of every transmission package is a GM/PCS 4-speed transmission. Vehicle manufacturers select the bellhousing, valve body, and parking brake options that meet their needs.

Interchangeable Bellhousing
PCS transmission packages are available with bellhousings for common engine flywheel housings including SAE3, SAE4 and more.


Parking Brake
The optional disc parking brake mounts directly to the transmission. The caliper can be mounted in several positions providing clearance for transmission tunnels or exhaust. The cable can be configured for left hand or right hand connection to the brake caliper.


Engine Adapters
Engine adapters are available for Deutz, Kubota, Perkins, Ford, Cummins.


Warranty
PCS offers a warranty for transmission packages used in validated installations. For more information regarding warranty and installation validation, please contact PCS.

CAPABILITIES
PCS offers two models of the GM 4-speed, the 4LHD and 4LHDX. Both models are enhanced versions of the GM 4L60/70 transmissions that have been in production since 1993.

The 4LHD is validated for gas and diesel applications up to 340 Nm (250 ft-lbs) of engine torque. Its features and enhancements over a stock 4L60 include:

• Produced using GM approved production processes and quality control
• Unique valve body and spacer plate calibrations for the harsh, industrial market
• Abuse Protection System (APS) Valve Body Assembly (Patented) to prevent operator induced premature transmission and vehicle wear
• Heat-treated stator shaft splines
• 258mm Torque converter with lockup clutch
• Induction and/or heat treated input/output shafts
• Internal input speed sensor (shift performance/control, Diagnostics)
• Internal Mode Switch (IMS)
• Heavier-duty low/reverse roller clutch
• 7-plate 3-4 clutch
• Heavy-duty, needle-type thrust bearings
• Hardened reaction sun gear shell

The 4LHDX is validated for gas and diesel applications up to 542 Nm (400 ft-lbs) engine torque. It includes all of the features described above plus:

• Induction hardened turbine shaft/output splines
• Output shaft includes process improvements for longer fatigue life
• 300mm torque converter with lockup clutch
• Five-pinion input and reaction gear sets

VALVE BODY FEATURES

Abuse Protection
Often times the operator causes the most damage to the transmission, reducing the service life and causing costly repairs and downtime. The PCS 4-speed abuse protection valve body protects the transmission by locking out reverse engagement until the vehicle is stopped and the engine is at idle. It also prevents "neutral drops" by only engaging the forward gears when the engine is at idle.

Electronic Range
Eliminate the shift cable and shift the transmission electronically with a push of a button or movement of a lever. Driver inputs can be validated based on vehicle modes and conditions so the vehicle is operated within standard operating protocols. Also eliminate transmission failures due to the shift cable not adjusted properly.

Inching
The PCS inching valve body allows the operator to move the vehicle forward or backward in small increments from an operator's panel remotely mounted on the vehicle. This greatly reduces time when connecting to trailers or other equipment and makes the operation more efficient for one person.

INPUT OPTIONS
The configuration of the engine mounting face varies according to engine usage. The 4LHD/4LHDX currently supports five types of mounting faces.

OUTPUT OPTIONS

All four standard extension housings available through PCS have integrated vehicle mounts. Any proposed boss locations and threaded fastener designs must have PCS Engineering approval for load analysis. Mount loads should be supplied by the customer. For an updated list of vehicle mount options reference the PCS OEM Parts Catalog. The factory torque rating for the six transmission to extension housing bolts is 37 ft*lbs / 45 N*m. In addition, the speed sensor bolt in 2WD applications has a torque rating of 8 lb*ft / 11 N*m.

A proper installation supports the transmission weight but must also:

• Avoid loading the internal components
• Allow for frame twist
• Absorb driveline torque
• To damp driveline shock forces
• Not exceed 200 lbs on transmission mount

ORDERING

For 2019, the GM/PCS 4-Speed transmission will be readily available for new vehicle designs and upgrade packages. For quotes and purchase orders, please contact pcs for assistance updating prior part numbers.

The following transmission components may be available under special order or remanufacturerd units, however they should not be implemented into new vehicle designs or upgrade packages.

• 1. PCS GENII Valve Bodies
• 2. GM LS Bellhousings
• 3. GM 2WD Slip Yoke Extension Housings
• 4. GM 4WD Extension Housing

PART#	VALVE BODY	CONVERTER	INPUT	OUTPUT
4LHD TRANSMISSIONS
TRN4347	GEN 3	GM 258mm	SAE4	Fixed Flange Output
TRN4447	GEN 3	GM 258mm	SAE4	4WD Output Shaft
TRN4267	GEN 3	GM 258mm	SAE4	C6 Replacement
TRN4265	GEN 3	C6 258mm	C6	C6 Replacement
TRN4362	GEN 3	C6 258mm	C6	Fixed Flange Output
TRN4462	GEN 3	C6 258mm	C6	4WD Output Shaft
4LHDX TRANSMISSIONS
TRN4331	GEN 3	GM 300mm	SAE4	Fixed Flange Output
TRN4431	GEN 3	GM 300mm	SAE4	4WD Output Shaft

NOTE:	Contact PCS for remanufacturing program options and more information on our core charges.